Safari Log In Issues
"Invalid form token. Please reload this form and submit again.” Even as the Admin I get this message sometimes and it will even kick me off at times (after getting logged in) saying my session has expired. I changed browsers and it helps.
Take a look at this page on your site: /index.php/dashboard/system/basics/timezone
You may need to hit the button there to fix the timezone if it's different to that of your database.
I'm not confident it's directly related, it's a bit of a long shot, but I've often wondered if the form token expires due to something relating to time settings.